using contraints on Mysql

[Raúl Andrés Duque Murillo]

Hi.
   
  I'm looking for using FIELD CONSTRAINTS on Mysql but I can´t find it ... 
Doesn´t Mysql implement it??
   
  For example:
  age int > 0
   
  Thanks,
   
  RAUL DUQUE
  Bogotá, Colombia
                
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